User manual

38
Theexamplebatteriesfromchapter8.a)wouldresultinthefollowingchargecurrents:
1000 mAh x 1.0 C = 1000 mA
2700 mAh x 1.0 C = 2700 mA
 The„ChargeManager2024“doesnotalwaysofferthepreciselyttingchargecurrent.
In such cases, the next lower current range is the correct choice. For the 2700 mAh rechargeable battery, this
means a max. charge current of 2500 mA.
A charge current limitation to 2C is recommended for:
• Rechargeablebatterieswiththeprint„Rapidcharge:60-70minutesatxxxmA“or„Rapidcharge“or„Rapid
chargingpossible“
For example, the 2700 mAh rechargeable battery is to be charged at 3000 mA here, since 2C exceeds the
maximum.
When charging a battery with a charge rate of 1C or 2C, the battery will heat up noticeably towards the
end of the charging process. This is normal.
c) Discharge Current
Inthe„ChargeManager2024“,adischargecurrentof125mAto750mAisavailableforNiMHandNiCdrecharge-
ablebatteriesinstepsof125mA;forNiZn-batteries,150,300,450and600mAcanbeselected.
For9V-blockbatteries,thedischargecurrentisselectedautomatically.Itisataratedcurrentof20mA.
 Long-termdeterminationofabattery‘scapacitycanbeusedtodetermineitscurrentcondition(capacityloss).
Thedeliveredcapacitydependsstronglyonthedischargecurrent:Thelowerthedischargecurrentthehigherthe
capacity that can be delivered. Since the battery is discharged via resistors, the actual discharge current depends
onthecurrentbatteryvoltage.Thisis,ofcourse,alsoconsideredinthecapacitycalculation(DCAP)ofthe„Charge
Manager2024“.
Normally,thebatterycapacityisdeterminedatadischargecurrentof0.2C.Fortheexamplebatteries,thismeans:
1000 mAh x 0.2 = 200 mA
2700 mAh x 0.2 = 540 mA
The discharge current must be chosen that comes closest to the calculated value. For the example
1000 mAh battery, these are 250 mA, and for the 2700 mAh batteries, a discharge current of 500 mA results.